EP1546796B1 - Illumination device for backlighting an image reproduction device - Google Patents

Illumination device for backlighting an image reproduction device Download PDF

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Publication number
EP1546796B1
EP1546796B1 EP03753271.0A EP03753271A EP1546796B1 EP 1546796 B1 EP1546796 B1 EP 1546796B1 EP 03753271 A EP03753271 A EP 03753271A EP 1546796 B1 EP1546796 B1 EP 1546796B1
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EP
European Patent Office
Prior art keywords
light
luminous
emitting diodes
illumination device
spots
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP03753271.0A
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German (de)
French (fr)
Other versions
EP1546796A1 (en
Inventor
Heinrich Noll
Ralf Mayer
Patrick Kromotis
Georg Bogner
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Ams Osram International GmbH
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Osram Opto Semiconductors GmbH
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Publication of EP1546796A1 publication Critical patent/EP1546796A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/484—Connecting portions
    • H01L2224/4847—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a wedge bond
    • H01L2224/48472—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a wedge bond the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
    • H01L2224/85909—Post-treatment of the connector or wire bonding area
    • H01L2224/8592—Applying permanent coating, e.g. protective coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other

Definitions

  • the invention relates to an illumination device for the backlighting of a light-valve-containing image display device, wherein each of a plurality of light-emitting diodes formed luminous dots are arranged in a grid pattern.
  • Image reproduction devices with light valves require a sufficiently bright and uniform backlighting. This is achieved with larger displays, such as computer screens, with fluorescent tubes.
  • larger displays such as computer screens, with fluorescent tubes.
  • the known lighting devices are not sufficient.
  • a very high luminance is required because the mirror image of the display must still be visible even at high ambient brightness.
  • GB 2 361 581 A on which the preamble of claim 1 is based, shows an arrangement with a light emitting diode disposed in a recess of a heat dissipating substrate.
  • Several such substrates can be arranged in a grid pattern, with a printed circuit connecting all light emitting diodes and substrates together.
  • this arrangement is difficult to manufacture.
  • the object of the invention is therefore to provide a lighting device which has a high luminance on a given area and at the same time can compensate for the failure of a light emitting diode.
  • This object is achieved by a lighting device according to claim 1.
  • the LEDs are each a luminous point are applied electrically isolated on the substantially flat surface of a submount and that the submounts are good heat conducting and good heat conducting connected to a flat heat-conducting support.
  • the invention makes advantageous use of the fact that a large number of small light-emitting diodes emit more light than a correspondingly large one since the entire free surface of the light-emitting diode radiates.
  • the invention ensures good heat dissipation.
  • the surface of the submounts is smaller than the area given by the grid surface and that are arranged on the not occupied by submounts surface of the carrier between the submounts on an insulating support lines for powering the light emitting diodes.
  • an advantageous heat-conducting connection between the light-emitting diodes and the carrier is possible without the lines applied in isolation hindering the heat conduction.
  • This development can be advantageously configured in that the lines are guided in a flexible film, which is continued outside the carrier as a flat cable. This is beyond the contacting of the cables with the light-emitting diodes within the illumination device no further contacting required, which contributes to reliability and cost manufacturability.
  • the submounts are made of silicon.
  • the carrier is made of ultra-pure aluminum or copper and / or that the carrier is connected to a heat sink.
  • a heat sink for example, is a large heat sink, which emits heat over a large surface as possible to the surrounding air.
  • so-called heatpipes are suitable as a heat sink.
  • gaps between the submounts are filled up with plastic.
  • the light-emitting diodes each emit a light spot of differently colored light.
  • Another advantageous embodiment is that two green-emitting LEDs, a blue-emitting and a red-emitting LED are provided per luminous spot. This highlights the green component of the light produced over the others, which is necessary to get white, for example about 60% green, 25% red and 15% blue.
  • the arrangement of the luminous dots on submounts has the advantage that the side walls of the light emitting diodes rise completely over the lines guided between the luminous points, so that the radiation emanating therefrom can be used.
  • the luminous dots are each surrounded by a reflector.
  • a recess containing the luminous dot formed by the reflector is filled with a transparent plastic.
  • the light source according to the invention has a high efficiency, long life, high reliability, defined radiation and - when using different colored light emitting diodes - a narrow-band radiation in different colors. This makes it possible to match the spectral emission of the light source and the spectral transmission of the color filters of the liquid crystal display and to minimize the light losses through the color filters. Due to the high efficiency of the LEDs, a high intensity is achieved with low heat generation.
  • the uniform distribution of the color dots over the entire visible surface leads to a further effective increase in the luminance.
  • the uniform distribution of the luminous dots over the entire visible surface leads to a uniform luminance distribution, which can be further increased by the bundling device.
  • the compact arrangement of the LEDs in each case a luminous spot leads to a good color mixing. Due to the white reflecting surface and the reflector shape, light that is now emitted at a less favorable angle is used. The use of very small Light-emitting diodes leads to a compact arrangement with a thickness of a few millimeters, for example 2 mm.
  • the LEDs require a very low operating voltage, so that expediently several LEDs are connected in series. If one of these light-emitting diodes fails, the others are no longer supplied with power and also fail. In order to reduce visibility of this effect or possibly even exclude, it is provided that in each case a light emitting diode of a light spot, each with a light-emitting diode of a plurality of other light points connected in series form a circuit.
  • the lighting device may be formed in a development such that the luminous points, the light emitting diodes each belong to a circuit are interleaved with luminous points of at least one other circuit. By nesting it is possible with suitable optical light distribution means to make the failure of a group hardly visible.
  • control means are provided for the currents supplied to the individual circuits, the currents in the circuits for the at least one other circuit for interrupting one of the circuits for the same color LEDs the same color LEDs and for differently colored LEDs of the same luminous points in the sense of a balance of the interruption caused by the color shift control.
  • the current in the at least one other electric circuit for the same-colored light-emitting diodes is increased. With this measure, both the brightness and the color can be restored to the original state.
  • the currents in the circuits for differently colored light-emitting diodes can be reduced. Although this reduces the brightness, the color can essentially be retained.
  • Another advantageous embodiment of the development consists in that a grid of 4 x 8 luminous dots is provided with two green-lit and two red-light emitting diodes, that four circuits are provided for the red-light emitting diodes, each two circuits are associated with the LEDs of the same luminous points, the are distributed across the grid in a checkerboard pattern.
  • the green-light emitting diodes are connected to eight circuits, wherein each one green-emitting light emitting diode of eight luminous points to one and another green light emitting diode of the same luminous points connected to another circuit.
  • Fig. 1 schematically represents an arrangement with a light source 1 and a display 3, wherein between the light source 1 and the display 3, an optical means for focusing the outgoing light from the light source 1 in the sense of a uniform distribution is provided on the surface of the display 3.
  • the distance between the light source and the display is a few centimeters.
  • a heat sink 4 On the back of the light source 1 is a heat sink 4 for heat dissipation.
  • Fig. 2 shows a plan view of the light source 1 with a white plastic frame, which contains in the illustrated embodiment, 8 x 4 holes in which luminous dots 6 are located.
  • the size of the plastic frame 5 corresponds to the visible area of the display.
  • the plastic frame 5 and the luminous dots 6 are located on an aluminum plate 7, which serves for fastening and heat dissipation. Lateral lines are led out in the form of a ribbon cable 8 for connecting the LEDs to a power source.
  • Fig. 3 shows an enlarged view of a light spot 6, which is formed by a hole in the plastic frame 5.
  • Four light-emitting diodes 9 are raised in the middle of the hole on a submount 10 ( Fig. 4 ) arranged.
  • the LEDs are connected via bonding wires 11 with lines 14, which are shown only schematically by hatching the area occupied by them.
  • one of the LEDs is red, two are green and the fourth is blue.
  • the light mixes with white.
  • the space between the submount 10 and the frame 5 is filled with a white potting compound 12, the surface 15 serves as a reflector for the emitted light from the side of the LEDs 9.
  • a transparent potting compound 13 ensures a smooth surface of the light source and the protection of the bonding wires and LEDs.
  • Fig. 5 schematically illustrates the connection of the light emitting diodes of an embodiment with 32 luminous points to circuits Since the multiplicity of connections can only be represented in an insufficient and confusing manner in a drawing, the light-emitting diodes whose power supply is shown or described in detail are marked with different symbols according to their belonging to individual circuits.
  • the columns of the grid are numbered from 1 to 8, while the rows are labeled with the letters A to D. Unlike the otherwise related reference numerals, the column numbers in Fig. 5 printed in italics.
  • one of the red LEDs R of the luminous points A1, A3, A5, A7, B2, B4 to D8 is connected to a circuit 21, which further includes a controllable current source 22 and a current measuring resistor 23.
  • the respective other red light-emitting diodes of the same luminous points, namely A1, A3 to D8, are connected to a further circuit 24 having a controllable current source 25 and a current measuring resistor 26.
  • the green LEDs of the luminous points A1, A3, B2, B4, C1 C3, D2 and D4 are connected to two other circuits, not shown.
  • Two further circuits, not shown supply the green LEDs of the illuminated points A5, A7, B6, B8, C5, C7, D6 and D8.
  • the power supply of the luminous dots A2, A4, A6, A8 to D7 is carried out accordingly.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Led Device Packages (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Led Devices (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Description

Die Erfindung betrifft eine Beleuchtungseinrichtung zur Hinterleuchtung einer Lichtventile enthaltenden Bildwiedergabevorrichtung, wobei jeweils von mehreren Leuchtdioden gebildete Leuchtpunkte rasterförmig angeordnet sind.The invention relates to an illumination device for the backlighting of a light-valve-containing image display device, wherein each of a plurality of light-emitting diodes formed luminous dots are arranged in a grid pattern.

Bildwiedergabevorrichtungen mit Lichtventilen, insbesondere Flüssigkristall-Displays, benötigen eine genügend helle und gleichmäßige Hinterleuchtung. Dies wird bei größeren Displays, wie beispielsweise Computer-Bildschirmen, mit Leuchtstoffröhren erzielt. Bei Anwendungen, die eine sehr hohe Leuchtdichte erfordern, reichen die bekannten Beleuchtungseinrichtungen jedoch nicht aus. So wird beispielsweise für sogenannte Head-up-Displays in Kraftfahrzeugen eine sehr hohe Leuchtdichte gefordert, da das Spiegelbild des Displays auch bei großer Umgebungshelligkeit noch sichtbar sein muss.Image reproduction devices with light valves, in particular liquid crystal displays, require a sufficiently bright and uniform backlighting. This is achieved with larger displays, such as computer screens, with fluorescent tubes. However, in applications that require a very high luminance, the known lighting devices are not sufficient. Thus, for example, for so-called head-up displays in motor vehicles, a very high luminance is required because the mirror image of the display must still be visible even at high ambient brightness.

GB 2 361 581 A , auf der die Präambel von Anspruch 1 basiert, zeigt eine Anordnung mit einer Leuchtdiode, die in einer Vertiefung eines Hitze ableitenden Substrats angeordnet ist. Mehrere solcher Substrate können rasterförmig angeordnet werden, wobei eine gedruckte Schaltung sämtliche Leuchtdioden und Substrate miteinander verbindet. Diese Anordnung ist jedoch schwierig herzustellen. GB 2 361 581 A , on which the preamble of claim 1 is based, shows an arrangement with a light emitting diode disposed in a recess of a heat dissipating substrate. Several such substrates can be arranged in a grid pattern, with a printed circuit connecting all light emitting diodes and substrates together. However, this arrangement is difficult to manufacture.

Aufgabe der Erfindung ist es daher, eine Beleuchtungseinrichtung anzugeben, die auf einer gegebenen Fläche eine hohe Leuchtdichte aufweist und gleichzeitig den Ausfall einer Leuchtdiode kompensieren kann. Diese Aufgabe wird erfindungsgemäß durch eine Beleuchtungseinrichtung gemäß Anspruch 1 gelöst. Dabei sind die Leuchtdioden jeweils eines Leuchtpunktes auf der im Wesentlichen ebenen Oberfläche eines Submounts elektrisch isoliert aufgebracht sind und dass die Submounts gut wärmeleitend sind und gut wärmeleitend mit einem flachen wärmeleitenden Träger verbunden sind.The object of the invention is therefore to provide a lighting device which has a high luminance on a given area and at the same time can compensate for the failure of a light emitting diode. This object is achieved by a lighting device according to claim 1. The LEDs are each a luminous point are applied electrically isolated on the substantially flat surface of a submount and that the submounts are good heat conducting and good heat conducting connected to a flat heat-conducting support.

Die Erfindung nutzt in vorteilhafter Weise aus, dass eine Vielzahl von kleinen Leuchtdioden mehr Licht aussenden als eine entsprechend große, da die gesamte freie Oberfläche der Leuchtdiode strahlt. Außerdem gewährleistet die Erfindung eine gute Wärmeableitung.The invention makes advantageous use of the fact that a large number of small light-emitting diodes emit more light than a correspondingly large one since the entire free surface of the light-emitting diode radiates. In addition, the invention ensures good heat dissipation.

Eine vorteilhafte Weiterbildung der erfindungsgemäßen Beleuchtungseinrichtung besteht darin, dass die Fläche der Submounts jeweils kleiner als die durch das Raster gegebene Fläche ist und dass auf der nicht von Submounts eingenommenen Fläche des Trägers zwischen den Submounts auf einem isolierenden Träger Leitungen zur Stromversorgung der Leuchtdioden angeordnet sind. Damit ist eine vorteilhafte wärmeleitende Verbindung zwischen den Leuchtdioden und dem Träger möglich, ohne dass die isoliert aufgebrachten Leitungen die Wärmeleitung behindern.An advantageous development of the lighting device according to the invention is that the surface of the submounts is smaller than the area given by the grid surface and that are arranged on the not occupied by submounts surface of the carrier between the submounts on an insulating support lines for powering the light emitting diodes. Thus, an advantageous heat-conducting connection between the light-emitting diodes and the carrier is possible without the lines applied in isolation hindering the heat conduction.

Diese Weiterbildung kann vorteilhaft dadurch ausgestaltet werden, dass die Leitungen in einer flexiblen Folie geführt sind, die außerhalb des Trägers als Flachleitung fortgesetzt ist. Damit ist außer der Kontaktierung der Leitungen mit den Leuchtdioden innerhalb der Beleuchtungseinrichtung keine weitere Kontaktierung erforderlich, was zur Betriebssicherheit und zur preiswerten Herstellbarkeit beiträgt.This development can be advantageously configured in that the lines are guided in a flexible film, which is continued outside the carrier as a flat cable. This is beyond the contacting of the cables with the light-emitting diodes within the illumination device no further contacting required, which contributes to reliability and cost manufacturability.

Vorzugsweise ist bei der Erfindung vorgesehen, dass die Submounts aus Silizium bestehen. Zur weiteren Verbesserung der Wärmeableitung kann bei der Erfindung vorgesehen sein, dass der Träger aus Reinst-Aluminium oder Kupfer besteht und/oder dass der Träger mit einer Wärmesenke verbunden ist. Als Wärmesenke eignet sich beispielsweise ein großer Kühlkörper, der über eine möglichst große Oberfläche Wärme an die umgebende Luft abgibt. Es sind ferner so genannte Heatpipes als Wärmesenke geeignet.Preferably, it is provided in the invention that the submounts are made of silicon. To further improve the heat dissipation can be provided in the invention that the carrier is made of ultra-pure aluminum or copper and / or that the carrier is connected to a heat sink. As a heat sink, for example, is a large heat sink, which emits heat over a large surface as possible to the surrounding air. Furthermore, so-called heatpipes are suitable as a heat sink.

Ferner ist bei der erfindungsgemäßen Beleuchtungseinrichtung vorzugsweise vorgesehen, dass Zwischenräume zwischen den Submounts mit Kunststoff aufgefüllt sind.Furthermore, it is preferably provided in the illumination device according to the invention that gaps between the submounts are filled up with plastic.

Um eine nicht als Leuchtdiode erhältliche Farbe zu erzielen oder ein farbiges Display zu hinterleuchten, ist vorgesehen, dass die Leuchtdioden jeweils eines Leuchtpunktes verschieden farbiges Licht aussenden.In order to achieve a color that is not available as a light-emitting diode or to backlight a colored display, it is provided that the light-emitting diodes each emit a light spot of differently colored light.

Die Verwendung mehrerer Leuchtdioden für jeweils einen Leuchtpunkt hat den Vorteil einer höheren Lichtausbeute gegenüber einer größeren Leuchtdiode. Es hat sich als günstig herausgestellt, wenn vier Leuchtdioden einen Leuchtpunkt bilden. Im Rahmen der Erfindung ist jedoch auch eine andere Zahl von Leuchtdioden pro Leuchtpunkt möglich.The use of a plurality of light-emitting diodes for each one light spot has the advantage of a higher light output compared to a larger light-emitting diode. It has turned out to be advantageous if four LEDs form a luminous dot. In the context of the invention, however, a different number of LEDs per luminous point is possible.

Eine andere vorteilhafte Ausgestaltung besteht darin, dass zwei grün leuchtende Leuchtdioden, eine blau leuchtende und eine rot leuchtende Leuchtdiode je Leuchtpunkt vorgesehen sind. Damit wird zwar die grüne Komponente des erzeugten Lichts gegenüber den anderen hervorgehoben, was notwendig ist, um weiß zu erhalten, beispielsweise circa 60 % grün, 25 % rot und 15 % blau.Another advantageous embodiment is that two green-emitting LEDs, a blue-emitting and a red-emitting LED are provided per luminous spot. This highlights the green component of the light produced over the others, which is necessary to get white, for example about 60% green, 25% red and 15% blue.

Die Anordnung der Leuchtpunkte auf Submounts hat den Vorteil, dass die Seitenwände der Leuchtdioden sich vollständig über die zwischen den Leuchtpunkten geführten Leitungen erheben, so dass die hiervon ausgehende Strahlung genutzt werden kann. Um diese zur Hinterleuchtung des Displays zu nutzen, ist bei einer anderen Weiterbildung der Erfindung vorgesehen, dass die Leuchtpunkte von jeweils einem Reflektor umgeben sind. Vorzugsweise ist dabei vorgesehen, dass eine vom Reflektor gebildete den Leuchtpunkt enthaltende Vertiefung mit einem transparenten Kunststoff aufgefüllt ist.The arrangement of the luminous dots on submounts has the advantage that the side walls of the light emitting diodes rise completely over the lines guided between the luminous points, so that the radiation emanating therefrom can be used. In order to use these for backlighting the display, it is provided in another development of the invention that the luminous dots are each surrounded by a reflector. Preferably, it is provided that a recess containing the luminous dot formed by the reflector is filled with a transparent plastic.

Die erfindungsgemäße Lichtquelle weist eine hohe Effizienz, hohe Lebensdauer, große Ausfallsicherheit, definierte Abstrahlung und - bei Verwendung verschiedenfarbiger Leuchtdioden - eine engbandige Abstrahlung in verschiedenen Farben auf. Damit ist es möglich, die spektrale Emission der Lichtquelle und spektrale Transmission der Farbfilter des Flüssigkristall-Displays in Übereinstimmung zu bringen und die Lichtverluste durch die Farbfilter gering zu halten. Durch die hohe Effizienz der Leuchtdioden wird eine große Intensität bei geringer Wärmeerzeugung erreicht.The light source according to the invention has a high efficiency, long life, high reliability, defined radiation and - when using different colored light emitting diodes - a narrow-band radiation in different colors. This makes it possible to match the spectral emission of the light source and the spectral transmission of the color filters of the liquid crystal display and to minimize the light losses through the color filters. Due to the high efficiency of the LEDs, a high intensity is achieved with low heat generation.

Die gleichmäßige Verteilung der Farbpunkte über die gesamte Sichtfläche führt in Verbindung mit einer geeigneten Bündelungseinrichtung zu einer weiteren effektiven Erhöhung der Leuchtdichte. Dabei führt die gleichmäßige Verteilung der Leuchtpunkte über die gesamte Sichtfläche zu einer gleichmäßigen Leuchtdichteverteilung, die durch die Bündelungseinrichtung weiter erhöht werden kann. Die kompakte Anordnung der Leuchtdioden in jeweils einem Leuchtpunkt führt zu einer guten Farbmischung. Durch die weiß reflektierende Fläche und die Reflektorform wird Licht, das nun unter ungünstigerem Winkel emittiert wird, genutzt. Die Verwendung von sehr kleinen Leuchtdioden führt zu einer kompakten Anordnung mit einer Dicke von wenigen Millimetern, beispielsweise 2 mm.The uniform distribution of the color dots over the entire visible surface, in conjunction with a suitable bundling device, leads to a further effective increase in the luminance. In this case, the uniform distribution of the luminous dots over the entire visible surface leads to a uniform luminance distribution, which can be further increased by the bundling device. The compact arrangement of the LEDs in each case a luminous spot leads to a good color mixing. Due to the white reflecting surface and the reflector shape, light that is now emitted at a less favorable angle is used. The use of very small Light-emitting diodes leads to a compact arrangement with a thickness of a few millimeters, for example 2 mm.

Die Leuchtdioden benötigen eine sehr niedrige Betriebsspannung, so dass zweckmäßigerweise mehrere Leuchtdioden in Reihe geschaltet werden. Bei Ausfall einer dieser Leuchtdioden werden die anderen nicht mehr mit Strom versorgt und fallen ebenfalls aus. Um eine Sichtbarkeit dieses Effekts zu verringern oder gegebenenfalls sogar auszuschließen, ist vorgesehen, dass jeweils eine Leuchtdiode eines Leuchtpunktes mit jeweils einer Leuchtdiode mehrerer anderer Leuchtpunkte in Reihe geschaltet einen Stromkreis bilden.The LEDs require a very low operating voltage, so that expediently several LEDs are connected in series. If one of these light-emitting diodes fails, the others are no longer supplied with power and also fail. In order to reduce visibility of this effect or possibly even exclude, it is provided that in each case a light emitting diode of a light spot, each with a light-emitting diode of a plurality of other light points connected in series form a circuit.

Um dabei zu verhindern, dass bei Ausfall einer Leuchtdiode besonders störende Streifen oder Flecken entstehen, kann die Beleuchtungseinrichtung in einer Weiterbildung derart ausgebildet sein, dass die Leuchtpunkte, deren Leuchtdioden jeweils zu einem Stromkreis gehören, mit Leuchtpunkten mindestens eines anderen Stromkreises verschachtelt angeordnet sind. Durch die Verschachtelung ist es mit geeigneten optischen Lichtverteilungsmitteln möglich, den Ausfall einer Gruppe kaum sichtbar zu machen.In order to prevent that in case of failure of a light emitting diode particularly disturbing streaks or stains, the lighting device may be formed in a development such that the luminous points, the light emitting diodes each belong to a circuit are interleaved with luminous points of at least one other circuit. By nesting it is possible with suitable optical light distribution means to make the failure of a group hardly visible.

Es sind mehrere gleichfarbige Leuchtdioden je Leuchtpunkt vorhanden, wobei die gleichfarbigen Leuchtdioden an verschiedene Stromkreise angeschlossen sind. Ohne weitere Maßnahmen tritt dabei eine Helligkeits- und Farbänderung auf, die für viele Anwendungen toleriert werden kann.There are several same color LEDs per luminous point available, the same color LEDs are connected to different circuits. Without further measures, a change in brightness and color occurs, which can be tolerated for many applications.

Ein Ausgleich der Farbänderung erfolgt dadurch, dass Steuereinrichtungen für die den einzelnen Stromkreisen zugeführten Ströme vorgesehen sind, die bei Unterbrechung eines der Stromkreise für gleichfarbige Leuchtdioden die Ströme in den Stromkreisen für den mindestens einen anderen Stromkreis für gleichfarbige Leuchtdioden und für andersfarbige Leuchtdioden der gleichen Leuchtpunkte im Sinne eines Ausgleichs der durch die Unterbrechung bedingten Farbverschiebung steuern.A compensation of the color change takes place in that control means are provided for the currents supplied to the individual circuits, the currents in the circuits for the at least one other circuit for interrupting one of the circuits for the same color LEDs the same color LEDs and for differently colored LEDs of the same luminous points in the sense of a balance of the interruption caused by the color shift control.

Sofern es in Hinblick auf die zulässige Verlustleistung der betroffenen Leuchtdioden möglich ist, kann dabei vorgesehen sein, dass der Strom in dem mindestens einen anderen Stromkreis für gleichfarbige Leuchtdioden heraufgesetzt wird. Mit dieser Maßnahme können sowohl die Helligkeit als auch die Farbe auf den Originalzustand gebracht werden.If it is possible with regard to the permissible power loss of the light-emitting diodes concerned, it can be provided that the current in the at least one other electric circuit for the same-colored light-emitting diodes is increased. With this measure, both the brightness and the color can be restored to the original state.

Sollte eine Leistungserhöhung der verbleibenden gleichfarbigen Leuchtdioden nicht möglich oder zweckmäßig sein, so können die Ströme in den Stromkreisen für andersfarbige Leuchtdioden herabgesetzt werden. Dadurch verringert sich zwar die Helligkeit, die Farbe kann jedoch im Wesentlichen erhalten bleiben.If an increase in power of the remaining same-colored light-emitting diodes is not possible or expedient, the currents in the circuits for differently colored light-emitting diodes can be reduced. Although this reduces the brightness, the color can essentially be retained.

Eine andere vorteilhafte Ausgestaltung der Weiterbildung besteht darin, dass ein Raster von 4 x 8 Leuchtpunkten mit jeweils zwei grünleuchtenden und zwei rotleuchtenden Leuchtdioden vorhanden ist, dass für die rotleuchtenden Leuchtdioden vier Stromkreise vorgesehen sind, wobei jeweils zwei Stromkreise den Leuchtdioden gleicher Leuchtpunkte zugeordnet sind, die schachbrettförmig über das Raster verteilt sind. Hierbei ist vorzugsweise vorgesehen, dass die grünleuchtenden Leuchtdioden an acht Stromkreise angeschlossen sind, wobei jeweils eine grünleuchtende Leuchtdiode von acht Leuchtpunkten an einen und eine weitere grünleuchtende Leuchtdiode von den gleichen Leuchtpunkten an einen anderen Stromkreis angeschlossen ist.Another advantageous embodiment of the development consists in that a grid of 4 x 8 luminous dots is provided with two green-lit and two red-light emitting diodes, that four circuits are provided for the red-light emitting diodes, each two circuits are associated with the LEDs of the same luminous points, the are distributed across the grid in a checkerboard pattern. In this case, it is preferably provided that the green-light emitting diodes are connected to eight circuits, wherein each one green-emitting light emitting diode of eight luminous points to one and another green light emitting diode of the same luminous points connected to another circuit.

Bei dieser Ausgestaltung wird berücksichtigt, dass wegen der unterschiedlichen benötigten Spannungen der rotleuchtenden und der grünleuchtenden Leuchtdioden und wegen einer zweckmäßigen Betriebsspannung in Höhe von etwa 40 V sechszehn rotleuchtende, jedoch nur acht grünleuchtende Leuchtdioden in Reihe geschaltet werden.In this embodiment, it is considered that because of the different voltages required the red-luminescent and the green-light emitting diodes and sixteen red-luminescent, but only eight green light emitting diodes are connected in series because of an appropriate operating voltage of about 40 V.

Die Erfindung lässt zahlreiche Ausführungsformen zu. Eine davon ist schematisch in der Zeichnung anhand mehrerer Figuren dargestellt und nachfolgend beschrieben. Es zeigen:

Fig. 1
eine stark schematisierte Darstellung eines mit der erfindungsgemäßen Beleuchtungseinrichtung hinterleuchteten Displays.
Fig. 2
eine Draufsicht durch ein Ausführungsbeispiel,
Fig. 3
eine vergrößerte Darstellung eines der Leuchtpunkte,
Fig. 4
eine Schnittdarstellung eines Leuchtpunktes und der den Leuchtpunkt umgebenden Teile des Ausführungsbeispiels und
Fig. 5
eine schematische Darstellung der Stromversorgung der Leuchtdioden.
The invention allows numerous embodiments. One of them is shown schematically in the drawing with reference to several figures and described below. Show it:
Fig. 1
a highly schematic representation of a backlit with the illumination device according to the invention displays.
Fig. 2
a plan view of an embodiment,
Fig. 3
an enlarged view of one of the luminous dots,
Fig. 4
a sectional view of a luminous point and surrounding the luminous point parts of the embodiment and
Fig. 5
a schematic representation of the power supply of the LEDs.

Fig. 1 stellt schematisch eine Anordnung mit einer Lichtquelle 1 und einem Display 3 dar, wobei zwischen der Lichtquelle 1 und dem Display 3 eine optische Einrichtung zur Bündelung des von der Lichtquelle 1 ausgehenden Lichts im Sinne einer gleichmäßigen Verteilung auf die Fläche des Displays 3 vorgesehen ist. Der Abstand zwischen Lichtquelle und Display beträgt einige Zentimeter. Auf der Rückseite der Lichtquelle 1 befindet sich ein Kühlkörper 4 zur Wärmeableitung. Fig. 1 schematically represents an arrangement with a light source 1 and a display 3, wherein between the light source 1 and the display 3, an optical means for focusing the outgoing light from the light source 1 in the sense of a uniform distribution is provided on the surface of the display 3. The distance between the light source and the display is a few centimeters. On the back of the light source 1 is a heat sink 4 for heat dissipation.

Fig. 2 zeigt eine Draufsicht auf die Lichtquelle 1 mit einem weißen Kunststoffrahmen, der bei dem dargestellten Ausführungsbeispiel 8 x 4 Löcher enthält, in denen sich Leuchtpunkte 6 befinden. Die Größe des Kunststoffrahmens 5 entspricht der sichtbaren Fläche des Displays. Der Kunststoffrahmen 5 und die Leuchtpunkte 6 befinden sich auf einer Aluminiumplatte 7, die zur Befestigung und Wärmeabführung dient. Seitlich sind Leitungen in Form eines Flachbandkabels 8 zur Verbindung der Leuchtdioden mit einer Stromquelle herausgeführt. Fig. 2 shows a plan view of the light source 1 with a white plastic frame, which contains in the illustrated embodiment, 8 x 4 holes in which luminous dots 6 are located. The size of the plastic frame 5 corresponds to the visible area of the display. The plastic frame 5 and the luminous dots 6 are located on an aluminum plate 7, which serves for fastening and heat dissipation. Lateral lines are led out in the form of a ribbon cable 8 for connecting the LEDs to a power source.

Fig. 3 zeigt eine vergrößerte Darstellung eines Leuchtpunktes 6, der von einem Loch in dem Kunststoffrahmen 5 gebildet ist. Vier Leuchtdioden 9 sind erhöht in der Mitte des Loches auf einem Submount 10 (Fig. 4) angeordnet. Die Leuchtdioden sind über Bonddrähte 11 mit Leitungen 14 verbunden, die lediglich schematisch durch Schraffur der von ihnen eingenommenen Fläche dargestellt sind. In einer bevorzugten Ausführungsform ist eine der Leuchtdioden rot leuchtend, zwei sind grün leuchtend und die vierte leuchtet blau. Bei dieser Anordnung mischt sich das Licht zu weiß. Der Raum zwischen dem Submount 10 und dem Rahmen 5 ist mit einer weißen Vergussmasse 12 aufgefüllt, deren Oberfläche 15 als Reflektor für das seitlich von den Leuchtdioden 9 ausgestrahlte Licht dient. Eine transparente Vergussmasse 13 sorgt für eine glatte Oberfläche der Lichtquelle und den Schutz der Bonddrähte und Leuchtdioden. Fig. 3 shows an enlarged view of a light spot 6, which is formed by a hole in the plastic frame 5. Four light-emitting diodes 9 are raised in the middle of the hole on a submount 10 ( Fig. 4 ) arranged. The LEDs are connected via bonding wires 11 with lines 14, which are shown only schematically by hatching the area occupied by them. In a preferred embodiment, one of the LEDs is red, two are green and the fourth is blue. In this arrangement, the light mixes with white. The space between the submount 10 and the frame 5 is filled with a white potting compound 12, the surface 15 serves as a reflector for the emitted light from the side of the LEDs 9. A transparent potting compound 13 ensures a smooth surface of the light source and the protection of the bonding wires and LEDs.

Fig. 5 stellt schematisch den Anschluss der Leuchtdioden eines Ausführungsbeispiels mit 32 Leuchtpunkten an Stromkreise dar. Da die Vielzahl der Verbindungen nur unzureichend und unübersichtlich in einer Zeichnung dargestellt werden kann, sind die Leuchtdioden, deren Stromversorgung im Einzelnen dargestellt oder beschrieben ist, mit verschiedenen Symbolen entsprechend ihrer Zugehörigkeit zu einzelnen Stromkreisen gekennzeichnet. Es sind zwei Stromkreise für rotleuchtende Leuchtdioden - im folgenden auch rote Leuchtdioden genannt - im Detail dargestellt. Die Spalten des Rasters sind mit 1 bis 8 nummeriert, während die Zeilen mit den Buchstaben A bis D gekennzeichnet sind. Zum Unterschied zu den anderweitig verwandten Bezugszeichen sind die Spaltennummern in Fig. 5 kursiv gedruckt. Fig. 5 schematically illustrates the connection of the light emitting diodes of an embodiment with 32 luminous points to circuits Since the multiplicity of connections can only be represented in an insufficient and confusing manner in a drawing, the light-emitting diodes whose power supply is shown or described in detail are marked with different symbols according to their belonging to individual circuits. There are two circuits for red light emitting LEDs - also called red light emitting diodes - shown in detail. The columns of the grid are numbered from 1 to 8, while the rows are labeled with the letters A to D. Unlike the otherwise related reference numerals, the column numbers in Fig. 5 printed in italics.

Jeweils eine der roten Leuchtdioden R der Leuchtpunkte A1, A3, A5, A7, B2, B4 bis D8 ist an einen Stromkreis 21 angeschlossen, der ferner eine steuerbare Stromquelle 22 und einen Strom-Messwiderstand 23 enthält. In gleicher Weise sind die jeweils anderen roten Leuchtdioden der gleichen Leuchtpunkte, nämlich A1, A3 bis D8 an einen weiteren Stromkreis 24 mit einer steuerbaren Stromquelle 25 und einem Strom-Messwiderstand 26 angeschlossen. Entsprechend sind die grünen Leuchtdioden der Leuchtpunkte A1, A3, B2, B4, C1 C3, D2 und D4 an zwei weitere nicht dargestellte Stromkreise angeschlossen. Zwei weitere nicht dargestellte Stromkreise versorgen die grünen Leuchtdioden der Leuchtpunkte A5, A7, B6, B8, C5, C7, D6 und D8. Die Stromversorgung der Leuchtpunkte A2, A4, A6, A8 bis D7 erfolgt entsprechend.In each case one of the red LEDs R of the luminous points A1, A3, A5, A7, B2, B4 to D8 is connected to a circuit 21, which further includes a controllable current source 22 and a current measuring resistor 23. In the same way, the respective other red light-emitting diodes of the same luminous points, namely A1, A3 to D8, are connected to a further circuit 24 having a controllable current source 25 and a current measuring resistor 26. Accordingly, the green LEDs of the luminous points A1, A3, B2, B4, C1 C3, D2 and D4 are connected to two other circuits, not shown. Two further circuits, not shown, supply the green LEDs of the illuminated points A5, A7, B6, B8, C5, C7, D6 and D8. The power supply of the luminous dots A2, A4, A6, A8 to D7 is carried out accordingly.

Im normalen Betriebszustand werden somit alle Leuchtdioden mit derart vorgegebenen Strömen versorgt, dass das resultierende Licht die gewünschte Farbe aufweist. Fällt nun beispielsweise eine der an den Stromkreis 21 angeschlossenen roten Leuchtdioden aus, wird dieses mit Hilfe des ausbleibenden Spannungsabfalls am Strom-Messwiderstand 23 festgestellt und die Stromquelle 25 im Sinne einer Erhöhung des Stroms im Stromkreis 24 gesteuert. Sollte dieses aus Gründen der Belastbarkeit der betroffenen Leuchtdioden oder der Wärmebilanz der einzelnen Leuchtpunkte nicht möglich sein, so kann - was in Fig. 5 nicht dargestellt ist - eine Herabsetzung der Ströme in den grünen Leuchtdioden vorgenommen werden.In the normal operating state, all LEDs are thus supplied with such predetermined currents that the resulting light has the desired color. If, for example, one of the red light-emitting diodes connected to the circuit 21 now fails, this is detected with the aid of the absence of a voltage drop at the current-measuring resistor 23 and the current source 25 is controlled in the sense of increasing the current in the current circuit 24. Should this be due to the load capacity of the affected light-emitting diodes or the heat balance the individual luminous points can not be possible, which can - what in Fig. 5 not shown - a reduction of the currents in the green LEDs are made.

Durch die Verschachtelung der Leuchtpunkte werden Strukturen, die bei Änderung der Farbe und/oder Helligkeit von an gleichen Stromkreisen angeschlossenen Leuchtpunkten entstehen, weniger sichtbar und können durch optische Mittel besser verteilt werden als beispielsweise bei einer zeilen- oder spaltenförmigen Zuordnung der Leuchtpunkte zu den jeweiligen Stromkreisen.By interleaving the luminous dots structures that arise when changing the color and / or brightness of connected to the same circuits luminous points, less visible and can be better distributed by optical means than, for example, in a line or column-shaped assignment of the luminous points to the respective circuits ,

Claims (17)

  1. Illumination device for backlighting an image reproduction device containing light valves, comprising a flat thermally conductive carrier (7) and luminous spots (6) formed by a plurality of light-emitting diodes (9) in each case, said luminous spots being arranged in grid form, wherein the light-emitting diodes of a respective luminous spot emit differently coloured light and wherein a respective light-emitting diode of one luminous spot with a respective light-emitting diode of a plurality of other luminous spots, connected in series, form an electric circuit, characterized
    in that the light-emitting diodes of a respective luminous spot (6) are applied in an electrically insulating manner on the substantially planar surface of a submount (10),
    in that the submounts (10) have good thermal conductivity and are connected to the flat thermally conductive carrier (7) in a manner exhibiting good thermal conductivity,
    in that a plurality of identically coloured light-emitting diodes are present per luminous spot, wherein the identically coloured light-emitting diodes are connected to different electric circuits, and
    in that control devices are provided for the currents fed to the individual electric circuits, which control devices, in the event of interruption of one of the electric circuits for identically coloured light-emitting diodes, control the currents in the at least one other electric circuit for identically coloured light-emitting diodes and in the electric circuits for differently coloured light-emitting diodes of the same luminous spots in the sense of compensating for the colour shift brought about by the interruption.
  2. Illumination device according to Claim 1, characterized in that the area of the submounts (10) is in each case less than the area provided by the grid, and in that lines (14) for supplying power to the light-emitting diodes (9) are arranged between the submounts (10) on an insulating carrier on that area of the carrier (7) which is not occupied by submounts (10).
  3. Illumination device according to Claim 2, characterized in that the lines (14) are routed in a flexible film that is continued as a flat lead (8) outside the carrier.
  4. Illumination device according to any of the preceding claims, characterized in that the submounts (10) consist of silicon.
  5. Illumination device according to any of the preceding claims, characterized in that the carrier (7) consists of ultrapure aluminium.
  6. Illumination device according to any of Claims 1 to 4, characterized in that the carrier (7) consists of copper.
  7. Illumination device according to any of the preceding claims, characterized in that the carrier (7) is connected to a heat sink.
  8. Illumination device according to Claim 2, characterized in that interspaces between the submounts (10) are filled with plastic (5, 12).
  9. Illumination device according to any of the preceding claims, characterized in that four light-emitting diodes (9) form a luminous spot (6).
  10. Illumination device according to Claim 9, characterized in that two green-luminous light-emitting diodes, one blue-luminous and one red-luminous light-emitting diode are provided per luminous spot (6).
  11. Illumination device according to any of the preceding claims, characterized in that the luminous spots (6) are surrounded by a respective reflector (15).
  12. Illumination device according to Claim 11, characterized in that a depression that is formed by the reflector (15) and contains the luminous spot is filled with a transparent plastic (13).
  13. Illumination device according to any of the preceding claims, characterized in that the luminous spots whose light-emitting diodes are in each case associated with one electric circuit are arranged in a manner interleaved with luminous spots of at least one other electric circuit.
  14. Illumination device according to any of the preceding claims, characterized in that the control devices are constituted such that the current in the at least one other electric circuit for identically coloured light-emitting diodes is increased.
  15. Illumination device according to any of the preceding claims, characterized in that the control devices are constituted such that the currents in the electric circuits for differently coloured light-emitting diodes are decreased.
  16. Illumination device according to any of the preceding claims, characterized in that a grid of 4 x 8 luminous spots having in each case two green-luminous and two red-luminous light-emitting diodes is present, in that four electric circuits are provided for the red-luminous light-emitting diodes, wherein two electric circuits in each case are assigned to the light-emitting diodes of identical luminous spots which are distributed over the grid in a chequered fashion.
  17. Illumination device according to Claim 16, characterized in that the green-luminous light-emitting diodes are connected to eight electric circuits, wherein in each case one green-luminous light-emitting diode of eight luminous spots is connected to one electric circuit and a further green-luminous light-emitting diode of the same luminous spots is connected to another electric circuit.
EP03753271.0A 2002-09-30 2003-09-01 Illumination device for backlighting an image reproduction device Expired - Fee Related EP1546796B1 (en)

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DE10245892A DE10245892A1 (en) 2002-09-30 2002-09-30 Illumination device for backlighting an image display device
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PCT/DE2003/002886 WO2004031844A1 (en) 2002-09-30 2003-09-01 Illumination device for backlighting an image reproduction device

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Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001342026A (en) 2000-05-30 2001-12-11 Tosoh Quartz Corp Method and apparatus of manufacturing quartz glass
ES2813107T3 (en) 2001-02-27 2021-03-22 Dolby Laboratories Licensing Corp Procedure and device for displaying an image
ES2675880T3 (en) 2002-03-13 2018-07-13 Dolby Laboratories Licensing Corporation Failure compensation of light emitting element on a monitor
US8687271B2 (en) 2002-03-13 2014-04-01 Dolby Laboratories Licensing Corporation N-modulation displays and related methods
DE10229067B4 (en) * 2002-06-28 2007-08-16 Osram Opto Semiconductors Gmbh Optoelectronic component and method for its production
DE10245933B4 (en) * 2002-09-30 2013-10-10 Osram Opto Semiconductors Gmbh Device for generating a bundled luminous flux
US7320531B2 (en) * 2003-03-28 2008-01-22 Philips Lumileds Lighting Company, Llc Multi-colored LED array with improved brightness profile and color uniformity
JP2006005290A (en) * 2004-06-21 2006-01-05 Citizen Electronics Co Ltd Light emitting diode
KR101097486B1 (en) * 2004-06-28 2011-12-22 엘지디스플레이 주식회사 back light unit of liquid crystal display device
EP1774594A2 (en) * 2004-07-27 2007-04-18 Koninklijke Philips Electronics N.V. Light emitting diode assembly
KR100643238B1 (en) * 2004-10-05 2006-11-10 삼성전자주식회사 Back light unit
WO2006038778A1 (en) 2004-10-05 2006-04-13 Samsung Electronics Co., Ltd. Backlight unit
US7296916B2 (en) * 2004-12-21 2007-11-20 3M Innovative Properties Company Illumination assembly and method of making same
WO2006066380A1 (en) 2004-12-23 2006-06-29 Dolby Canada Corporation Wide color gamut displays
DE102006002275A1 (en) * 2005-01-19 2006-07-20 Osram Opto Semiconductors Gmbh lighting device
DE102005031336B4 (en) 2005-05-13 2008-01-31 Osram Opto Semiconductors Gmbh projection device
KR100780198B1 (en) * 2005-07-11 2007-11-27 삼성전기주식회사 Plane light source using leds having improved color stain characteristic and lcd backlight unit comprising the same
KR100691191B1 (en) * 2005-07-15 2007-03-09 삼성전기주식회사 Plane light source using light emitting diode and lcd backlight unit comprising the same
US20070019129A1 (en) * 2005-07-20 2007-01-25 Cree, Inc. Independent control of light emitting diodes for backlighting of color displays
DE102005042066A1 (en) 2005-09-03 2007-03-15 Osram Opto Semiconductors Gmbh Backlight arrangement with arranged in lighting groups semiconductor light sources
DE102006033893B4 (en) 2005-12-16 2017-02-23 Osram Opto Semiconductors Gmbh lighting device
DE102006033894B4 (en) 2005-12-16 2019-05-09 Osram Gmbh Lighting device and display device with a lighting device
TWI270725B (en) * 2006-03-17 2007-01-11 Innolux Display Corp Light source array, backlight module and liquid crystal display
CN101416323B (en) * 2006-04-10 2011-03-30 夏普株式会社 LED components, illumination apparatus, and liquid crystal display having the same
DE102006050880A1 (en) * 2006-06-30 2008-04-17 Osram Opto Semiconductors Gmbh Opto-electronic component and illumination device
CN101783341B (en) * 2006-08-15 2012-05-09 财团法人工业技术研究院 LED light-source module with heat dissipation structure
EP1895602B1 (en) * 2006-08-29 2019-01-23 Toshiba Lighting & Technology Corporation Illumination apparatus having a plurality of semiconductor light-emitting devices
US9564070B2 (en) * 2006-10-05 2017-02-07 GE Lighting Solutions, LLC LED backlighting system for cabinet sign
DE102006048230B4 (en) 2006-10-11 2012-11-08 Osram Ag Light-emitting diode system, method for producing such and backlighting device
US8471807B2 (en) 2007-02-01 2013-06-25 Dolby Laboratories Licensing Corporation Calibration of displays having spatially-variable backlight
KR20090015734A (en) 2007-08-09 2009-02-12 엘지이노텍 주식회사 Lighting device
US8664674B2 (en) * 2007-08-28 2014-03-04 Panasonic Corporation Light emitting diode device preventing short circuiting between adjacent light emitting diode chips
DE102007044476A1 (en) * 2007-09-18 2009-03-19 Osram Gesellschaft mit beschränkter Haftung Lighting unit and method for controlling the lighting unit
DE102008016458A1 (en) 2008-03-31 2009-10-01 Osram Gesellschaft mit beschränkter Haftung Printed circuit board for use in e.g. lighting device, has heat dissipating element arranged in through-hole, and radiation source i.e. LED, arranged on heat dissipating element, where heat dissipating element is electrically conductive
US20090322800A1 (en) 2008-06-25 2009-12-31 Dolby Laboratories Licensing Corporation Method and apparatus in various embodiments for hdr implementation in display devices
US20100214282A1 (en) 2009-02-24 2010-08-26 Dolby Laboratories Licensing Corporation Apparatus for providing light source modulation in dual modulator displays
TWI354365B (en) 2009-08-26 2011-12-11 Quasioptical led package structure for increasing
CN102207251A (en) * 2010-03-30 2011-10-05 欧司朗有限公司 LED (light emitting diode) module and manufacturing method thereof
DE102010038396B4 (en) * 2010-07-26 2021-08-05 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung Optoelectronic component and lighting device with it
WO2013038304A1 (en) * 2011-09-14 2013-03-21 Koninklijke Philips Electronics N.V. Reflective coating for a light emitting device mount
TWI462330B (en) * 2011-11-17 2014-11-21 Episil Technologies Inc Submount for light emitting diode and method for fabricating the same
MX349428B (en) * 2012-08-20 2017-07-28 Cooper Technologies Co Lighting applications using organic light emitting diodes.
JP6277698B2 (en) * 2013-12-10 2018-02-14 株式会社デンソー Projector for vehicle
JP2015185760A (en) * 2014-03-25 2015-10-22 東芝ライテック株式会社 Light emitting module
US10718474B1 (en) 2014-11-20 2020-07-21 The Light Source, Inc. Lighting fixture with closely-packed LED components
JP6633881B2 (en) * 2015-09-30 2020-01-22 ローム株式会社 LED lighting fixture and method of manufacturing the same
CN106017868B (en) * 2016-05-12 2018-06-01 齐鲁工业大学 The Spectral matching method of multi-channel LED lighting system based on luminance parameter

Family Cites Families (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158606A (en) 1984-12-28 1986-07-18 株式会社小糸製作所 Lighting apparatus
JPH0372840A (en) 1989-08-11 1991-03-28 Fuji Electric Co Ltd Device for detecting thawing degree
US5119174A (en) * 1990-10-26 1992-06-02 Chen Der Jong Light emitting diode display with PCB base
JPH07262810A (en) 1994-03-18 1995-10-13 Sony Tektronix Corp Luminous device
US5857767A (en) * 1996-09-23 1999-01-12 Relume Corporation Thermal management system for L.E.D. arrays
JP3572924B2 (en) 1997-03-06 2004-10-06 松下電器産業株式会社 Light emitting device and recording device using the same
TW408497B (en) * 1997-11-25 2000-10-11 Matsushita Electric Works Ltd LED illuminating apparatus
US6476783B2 (en) * 1998-02-17 2002-11-05 Sarnoff Corporation Contrast enhancement for an electronic display device by using a black matrix and lens array on outer surface of display
US6897855B1 (en) 1998-02-17 2005-05-24 Sarnoff Corporation Tiled electronic display structure
WO1999056504A1 (en) * 1998-04-29 1999-11-04 Koninklijke Philips Electronics N.V. Circuit arrangement for a semiconductor light source
JP4171107B2 (en) 1998-07-09 2008-10-22 スタンレー電気株式会社 Planar light source
JP2000133029A (en) 1998-10-30 2000-05-12 Tb Optical Kk Light source device
US6127783A (en) 1998-12-18 2000-10-03 Philips Electronics North America Corp. LED luminaire with electronically adjusted color balance
JP3072840B1 (en) 1999-01-29 2000-08-07 川崎重工業株式会社 Gallstone crusher
US6439731B1 (en) * 1999-04-05 2002-08-27 Honeywell International, Inc. Flat panel liquid crystal display
DE19921684B4 (en) 1999-05-12 2006-01-19 Vossloh-Schwabe Optoelectronic Gmbh & Co. Kg Lighting element with semiconductor chips
DE19931689A1 (en) * 1999-07-08 2001-01-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Planar LED assembly on thermally-conductive board, increases cooling, component packing density and life, whilst permitting active device integration to form display- or illumination panel in or on e.g. vehicle
US6194839B1 (en) * 1999-11-01 2001-02-27 Philips Electronics North America Corporation Lattice structure based LED array for illumination
JP2001237462A (en) 2000-02-22 2001-08-31 Sanyo Electric Co Ltd Light-emitting device
DE10008203B4 (en) 2000-02-23 2008-02-07 Vishay Semiconductor Gmbh Method for producing electronic semiconductor components
DE20005862U1 (en) * 2000-03-30 2000-08-24 Richard Wöhr GmbH, 75339 Höfen Display device
DE10016817A1 (en) * 2000-04-05 2001-10-18 Mannesmann Vdo Ag Color head-up display, especially for a vehicle
GB2361581A (en) 2000-04-20 2001-10-24 Lite On Electronics Inc A light emitting diode device
JP2001308384A (en) 2000-04-20 2001-11-02 Fujitsu General Ltd Light-emitting element drive control system
US6960817B2 (en) * 2000-04-21 2005-11-01 Canon Kabushiki Kaisha Solid-state imaging device
JP2002009349A (en) 2000-06-26 2002-01-11 Koha Co Ltd Surface emission led and its manufacturing method
US6888529B2 (en) * 2000-12-12 2005-05-03 Koninklijke Philips Electronics N.V. Control and drive circuit arrangement for illumination performance enhancement with LED light sources
GB2370103B (en) 2000-12-14 2004-11-10 P L M Illumination Ltd LED lighting unit
US20020101362A1 (en) * 2001-01-26 2002-08-01 Nishimura Ken A. Backup traffic control in the event of power failure
DE10137042A1 (en) * 2001-07-31 2003-02-20 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Planar light source based on LED
CN1464953A (en) * 2001-08-09 2003-12-31 松下电器产业株式会社 Led illuminator and card type led illuminating light source
JP4067801B2 (en) * 2001-09-18 2008-03-26 松下電器産業株式会社 Lighting device
DE10245580B4 (en) * 2002-09-27 2006-06-01 Siemens Ag Device for generating an image
US7138659B2 (en) * 2004-05-18 2006-11-21 Onscreen Technologies, Inc. LED assembly with vented circuit board

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DE10245892A1 (en) 2004-05-13
WO2004031844A1 (en) 2004-04-15
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US8042964B2 (en) 2011-10-25
JP4206380B2 (en) 2009-01-07
EP1546796A1 (en) 2005-06-29

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